| A | B |
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| Cerebrum | The portion of the brain that occupies the upper part of the cranial cavity and is concerned with higher mental functions. |
| Cerebellum | The portion of the brain that coordinates skeletal muscle movement. |
| Brain stem | The portion of the brain that includes the midbrain, pons, and medulla oblongata. |
| Cerebral hemisphere | One of the large, paired structures that together constitute the cerebrum of the brain. |
| Corpus callosum | A mass of white matter within the brain, composed of nerve fibers connecting the right and left cerebral hemispheres. |
| Fissure | A narrow cleft separating parts, such as the lobes of the cerebrum. |
| Cerebral cortex | The outer layer of the cerebrum. |
| Thalamus | A mass of gray matter located at the base of the cerebrum in the wall of the third ventricle. |
| Hypothalamus | A portion of the brain located below the thalamus. |
| Optic chiasma | An X shaped structure on the underside of the brain, formed by a partial crossing over of optic nerve fibers. |
| Pituitary gland | The endocrine gland that is attached to the base of the brain and consists of anterior and posterior lobes. |
| Pineal gland | A small structure located in the central part of the brain. |
| Midbrain | A small region of the brain stem located between the diencephalon and pons. |
| Pons | A portion of the brain stem above the medulla oblongata and below the midbrain. |
| Medulla oblongata | The portion of the brain stem located between the pons and the spinal cord. |
| Limbic system | A group of interconnected structures within the brain that functions to produce various emotional feelings. |
| Reticular formation | A complex network of nerve fibers within the brain stem that functions in arousing the cerebrum. |
| Frontal lobe | Forms the anterior portion of each cerebral hemisphere. |
| Parietal lobe | Is posterior to the frontal lobe and seperated from it by the central sulcus. |
| Temporal lobe | Lies below the frontal and parietal lobes and is seperated from them by the lateral sulcus. |
| Occipital lobe | Forms the posterior portion of each cerebral hemisphere and is seperated from the cerebellum by a shelflike extension of dura mater. |
| Motor area | A region of the brain from which impulses to muscles or glands originate. |
| Sensory area | A portion of the cerebral cortex that receives and interprets sensory nerve impulses. |
| Association area | A region of the cerebral cortex related to memory, reasoning, judgement, and emotional feelings. |
| Ventricle | A cavity, such as those of the brain that are filled with cerebrospinal fluid or those of the heart that contain blood. |
| Choroid plexus | A mass of specialized capillaries from which cerebrospinal fluid is secreted. |
| Diencephalon | A portion of the brain in the region of the third ventricle that includes the thalamus and hypothalamus. |
| Peripheral nervous system | The portions of the nervous system outside the central nervous system. |
| Central nervous system | The portion of the nervous system that consists of the brain and spinal cord. |
| Cranial nerve | A nerve that arises from the brain. |
| Gyri | The ridges on the cerebrum. |
| Sulcus | A shallow groove, such as that between adjacent convolutions on the surface of the brain. |
